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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and Automatic Espresso Machine mind-blowing filter technology to create the coffee we love. How exactly does it work?

To make an espresso machines home, hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference.

The Group Head

The group head is the portafilter that is inserted when you are making espresso. It is responsible for dispersing water into the portafilter and then controlling the pressure that results from the extraction. There are many different kinds of group heads each with its unique advantages and disadvantages. Some are specifically designed for stability of temperature while others are built to handle pre-infusion. Others are built to control the lever. Some include a combination such as the E61. This is a popular choice among baristas since it provides multiple benefits in one package.

As you can see in the above photo The group head features several notches to place your portafilter and then twist it manually to lock it in. A gasket made of rubber is positioned in the notches bean to cup espresso machines make a seal when you insert your portafilter. The notches permit the precise placement of the portafilter. This is essential for an accurate extraction.

In addition to allowing you easily insert your portafilter, the group head is also responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it is always at the right temperature for extraction. This is important because just a few degrees could mean the difference between good and great espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever that pressurize water, rotating espresso machines rely upon motorized pumps that provide the nine atmospheric bars of pressure that are required to extract espresso. The pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior it is shot through the ground coffee in the group head.

Pumps are generally cheaper and last longer than piston-driven machines. However, both types of machines are susceptible to degrading due to excessive use and automatic espresso machine inadequate cleaning. They also make mechanically complex and can lead to the cost of even the simplest models.

Some espresso machines do away with the pump completely and instead use steam pressure to brew espresso. This can result in over-extraction because the boiler that produces steam also heats the water until it comes to a boil. Additionally these machines are often required to restore their pressure between cups, which requires time and energy.

Many espresso machines utilize a vibration or rotary pump, which is a vibration model that uses a vibrating disc to generate the pressure, and a rotary model pushing hot water through the grounds at high speed. Both types of machine can produce an excellent espresso, however the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the part that heats water to an optimal temperature to extract. The steam that is produced reaches the portafilter that contains the ground espresso coffee, and is then pumped into the cup. The steam creates enough pressure to push the coffee grounds through. This results in a crema on top of the espresso. This is one of the hallmarks of a great espresso coffee machines uk.

There are three kinds of espresso machines, each with different pumps and the temperature of the brew. There are various ways in which the brew could be controlled and the size of the cup that the machine is capable of making.

The first espresso machines were steam-types. They used one boiler to make steam and brew, however the pressure they were able to create was minimal - two bars of atmospheric pressure, at most. The coffee espresso machine tasted bitter and burned. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most common espresso maker is a semi-automatic espresso machine one with an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic espresso machine, you grind the beans and then tamp them by hand. However, the pump provides regulated water flow and pressure. This is a great combination of human control and mechanized consistency.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from the hot water. The filter is also an essential component of the machine's temperature control, since it helps to prevent overheating.

Filters also aid in flavor since it allows for a longer flowering phase. This allows beans to release their flavor and gives an opportunity for better extraction.

It is important to keep in mind that even the best filter can produce a bad cup of coffee. The quality of the beans and the extraction, remain crucial.

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy used to place the grounds of coffee into while making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight container to make steam. The steam then pushes hot water into the grounds of the coffee under pressure. These kinds of machines are generally cheaper and easier to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, compressed air-driven espresso machines have become more popular. They use an air compressor to force hot water through grounds and are significantly more portable than electric steam-driven machines.